Research Outputs

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Now showing 1 - 2 of 2
  • Publication
    Numerical and experimental characterization of a novel low-cost thermal air flow sensor
    (IEEE, 2017) ; ;
    Glatzl, Thomas 
    ;
    Sauter, Thilo 
    To enable highly efficient operation of large scaled ventilation systems a continuous measured and well located air flow monitoring for control purposes and energy management is needed. The air flow monitoring solution is targeting low manufacturing cost as well as sufficient accuracy when operating near complex duct flows like pipe bends and tees. Therefore, a novel, low-cost, thermal air flow sensor, which takes non-uniform velocity profiles into account, is presented and characterized due to its application in heating, ventilation and air conditioning systems. Extensive numerical simulations and experimental investigations in an operating ventilation system show reasonable results and prove basic feasibility of the suggested novel sensor concept.
      80  1Scopus© Citations 3
  • Publication
    A Thermal Flow Sensor Based on Printed Circuit Technology in Constant Temperature Mode for Various Fluids
    (MDPI, 2019)
    Glatzl, Thomas 
    ;
    Beigelbeck, Roman 
    ;
    Cerimovic, Samir 
    ;
    Steiner, Harald 
    ;
    ;
    Sauter, Thilo 
    ;
    Treytl, Albert 
    ;
    Keplinger, Franz 
    We present a thermal flow sensor designed for measuring air as well as water flow velocities in heating, ventilation, and air conditioning (HVAC) systems. The sensor is designed to integrate the flow along the entire diameter of the pipe also quantifying the volume flow rate of the streaming fluid where the calorimetric principle in constant temperature operation is utilized as a readout method. In the constant temperature mode, a controller keeps a specific excess temperature between sensing elements at a constant level resulting in a flow dependent heater voltage. To achieve cost-effective sensors, the fabrication of the transducer is fully based on printed circuit board technology allowing low-cost mass production with different form factors. In addition, 2D-FEM simulations were carried out in order to predict the sensor characteristic of envisaged setups. The simulation enables a fast and easy way to evaluate the sensor’s behaviour in different fluids. The results of the FEM simulations are compared to measurements in real environments, proving the credibility of the model.
      452Scopus© Citations 8